# LM311PWR

**Texas Instruments** · Comparators · TSSOP-8

LM311PWR from Texas Instruments, in a TSSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | EMIT OUT | output | Output emitter capable of driving loads referenced to ground or supply rails, rated for maximum 30V from emitter to VCC-. |
| 2 | IN+ | input | Noninverting input of the differential comparator accepting input voltages between VCC- + 0.5V and VCC+ - 1.5V. |
| 3 | IN- | input | Inverting input of the differential comparator accepting input voltages between VCC- + 0.5V and VCC+ - 1.5V. |
| 4 | VCC- | power_in | Negative supply voltage rail with minimum rating of -18V. |
| 5 | BALANCE | input | Offset voltage balance adjustment input. |
| 6 | BAL/STRB | input | Strobe input that drives the output to the off state when pulled low. |
| 7 | COL OUT | output | Output collector capable of driving loads referenced to ground or supply rails, rated for maximum 40V from collector to VCC-. |
| 8 | VCC+ | power_in | Positive supply voltage rail with maximum rating of +18V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM311PWR`
- Footprint: `Package_SO:TSSOP-8_3x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm311pwr-etched.step` / `lm311pwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm311pwr.step` / `lm311pwr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm311.pdf) (42 pp, sha256 `1877bb45737cb7e8`, retrieved 2026-10-05, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm311pwr-datasheet.pdf)